Category Archives: Ultrasonic

Cavitation and ultrasonics

Cavitation is formation of vapor bubbles of a following liquid in a region where the pressure of liquid falls below its vapor pressure. Cavitation is usually of two types namely inertial (or transient) cavitation and non inertial cavitation. Inertial cavitation is the … Continue reading

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Detection of ultrasonic waves

Ultrasonic waves can be detected by various methods as listed below: (a)Using radiometer: Ultrasonic waves can be detected using Radiometer. In this method ultrasonic beam is made to fall on a thin mica fan suspended by a thin wire carrying … Continue reading

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Production of ultrasonic waves using piezoelectric generator

A magnetostriction generator can produce ultrasonic waves of comparatively low frequency. For generating high frequency ultrasonic waves, piezoelectric generator is used.       Piezoelectric Generator. It is found that when pressure or compression  is applied on two opposite faces of … Continue reading

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Production of ultrasonic waves by magnetostriction method

Magnetostriction: When magnetic field is applied across the length of a ferromagnetic  rod such as Nickel, then change in the length of rod is observed. This is called Magnetostriction. The charge in length is propotional to the strength of megnetic … Continue reading

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Production of ultrasonic waves by Galton Whistle method

Ultrasonics can be produced by means of (i) Galton’s Whistle (ii) Magnetostriction Generator  (ii) Piezoelectric Generator or Oscillator. Galton’s Whistle. It contains of essentially a short cylindrical pipe blown in the form of an annular nozzle. The distance of nozzle from … Continue reading

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9 properties of ultrasonic waves

The following are the main properties of ultrasonic waves: The ultrasonic waves cannot travel through vacuum. These waves travel with speed of sound in a given medium. Their velocity remains constant in homogeneous media. These waves can weld certain plastics, … Continue reading

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4 types of ultrasonic waves

Definition of ultrasonic waves: Ultrasonic waves are acoustic waves whose frequency is more than 20kHz .They travel with the speed of sound. Hence their wave length is smaller than 333200cms-1/ 20000Hz = 1.66 cm  (ג = v/υ) . These waves … Continue reading

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